Table 1.

Study population

GroupCategoryCountryEtiologic agentNo. of alpacasNo. of llamas
1Confirmed TBGBM. bovis3410
SwitzerlandM. microtia17
2Presumed TB-freeSwitzerlandNDb1422
United StatesND82100
3Culture-negative (from exposed herds)GBNone936
SwitzerlandNone160
  • a Generalized disease due to M. microti was diagnosed by positive culture (1 alpaca and 4 llamas) or was strongly suspected (3 llamas from the known M. microti-infected herd) based on gross lesions consistent with mycobacteriosis and/or suggestive symptoms.

  • b ND, not done.